Document Number: MC33984
Rev. 11.0, 11/2009
Freescale Semiconductor
Technical Data
Dual Intelligent High-current
Self-protected Silicon High Side
Switch (4.0 mΩ)
33984B/C
The 33984 is a dual self-protected 4.0 mΩ silicon switch used to
replace electromechanical relays, fuses, and discrete devices in
power management applications. The 33984 is designed for harsh
environments, and it includes self-recovery features. The device is
suitable for loads with high inrush current, as well as motors and all
types of resistive and inductive loads.
HIGH SIDE SWITCH
Programming, control, and diagnostics are implemented via the
Serial Peripheral Interface (SPI). A dedicated parallel input is available
for alternate and pulse-width modulation (PWM) control of each
output. SPI-programmable fault trip thresholds allow the device to be
adjusted for optimal performance in the application.
The 33984 is packaged in a power-enhanced 12 x 12 nonleaded
PQFN package with exposed tabs.
BOTTOM VIEW
PNA SUFFIX
98ARL10521D
16-PIN PQFN
Features
• Dual 4.0 mΩ max high side switch with parallel input or SPI control
• 6.0 to 27 V operating voltage with standby currents < 5.0 μA
• Output current monitoring with two SPI-selectable current ratios
• SPI control of over-current limit, over-current fault blanking time,
output-OFF open load detection, output ON/OFF control, watchdog
timeout, slew rates, and fault status reporting
ORDERING INFORMATION
Temperature
Package
Device
Range (T )
A
• SPI status reporting of over-current, open and shorted loads, over-
temperature, under-voltage and over-voltage shutdown, fail-safe
pin status, and program status
MC33984BPNA/R2
MC33984CPNA/R2
-40°C to 125°C
16 PQFN
• Enhanced -16 V reverse polarity VPWR protection
VDD
VDD
VDD
VPWR
33984
VDD
FS
VPWR
GND
I/O
I/O
WAKE
HS1
HS0
SI
SO
SCLK
CS
SCLK
CS
MCU
SO
SI
LOAD
RST
INO
IN1
I/O
I/O
I/O
LOAD
CSNS
FSI
A/D
GND
Figure 1. 33984 Simplified Application Diagram
Freescale Semiconductor, Inc. reserves the right to change the detail specifications,
as may be required, to permit improvements in the design of its products.
© Freescale Semiconductor, Inc., 2007-2009. All rights reserved.